Called when the provider is being asked to supply a value for the given key

Keys supplied to providers are a list of atoms which represent the path of the configuration key, beginning with the application name:

NOTE: This is currently unused, but provides an API for fetching config values from specific providers, which may come in handy down the road. A default implementation is provided for you, which fetches values from the application environment.

Examples

> MyProvider.get([:myapp, :server, :port])
{:ok, 8080}

> MyProvider.get([:maypp, :invalid, :key])
nil

Callback implementation for Mix.Releases.Config.Provider.get/1.

Given a path to a config file, this function will return the quoted AST of that config and all configs that it imports.